sysdeps/unix/sysv/linux/powerpc/sysconf.c

   1 /* Get system-specific information at run-time.  Linux/powerpc version.
   2    Copyright (C) 2017-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <sys/auxv.h>
  22
  23 static long linux_sysconf (int name);
  24
  25 static inline long
  26 auxv2sysconf_cache_associativity (unsigned long type)
  27 {
  28   return (__getauxval (type) & 0xffff0000) >> 16;
  29 }
  30
  31 static inline long
  32 auxv2sysconf_cache_linesize (unsigned long type)
  33 {
  34   return __getauxval (type) & 0xffff;
  35 }
  36
  37 /* Get the value of the system variable NAME.  */
  38 long int
  39 __sysconf (int name)
  40 {
  41   switch (name)
  42     {
  43       case _SC_LEVEL1_ICACHE_SIZE:
  44         return __getauxval (AT_L1I_CACHESIZE);
  45       case _SC_LEVEL1_ICACHE_ASSOC:
  46         return auxv2sysconf_cache_associativity (AT_L1I_CACHEGEOMETRY);
  47       case _SC_LEVEL1_ICACHE_LINESIZE:
  48         return auxv2sysconf_cache_linesize (AT_L1I_CACHEGEOMETRY);
  49       case _SC_LEVEL1_DCACHE_SIZE:
  50         return __getauxval (AT_L1D_CACHESIZE);
  51       case _SC_LEVEL1_DCACHE_ASSOC:
  52         return auxv2sysconf_cache_associativity (AT_L1D_CACHEGEOMETRY);
  53       case _SC_LEVEL1_DCACHE_LINESIZE:
  54         return auxv2sysconf_cache_linesize (AT_L1D_CACHEGEOMETRY);
  55       case _SC_LEVEL2_CACHE_SIZE:
  56         return __getauxval (AT_L2_CACHESIZE);
  57       case _SC_LEVEL2_CACHE_ASSOC:
  58         return auxv2sysconf_cache_associativity (AT_L2_CACHEGEOMETRY);
  59       case _SC_LEVEL2_CACHE_LINESIZE:
  60         return auxv2sysconf_cache_linesize (AT_L2_CACHEGEOMETRY);
  61       case _SC_LEVEL3_CACHE_SIZE:
  62         return __getauxval (AT_L3_CACHESIZE);
  63       case _SC_LEVEL3_CACHE_ASSOC:
  64         return auxv2sysconf_cache_associativity (AT_L3_CACHEGEOMETRY);
  65       case _SC_LEVEL3_CACHE_LINESIZE:
  66         return auxv2sysconf_cache_linesize (AT_L3_CACHEGEOMETRY);
  67       default:
  68         return linux_sysconf (name);
  69     }
  70 }
  71
  72 /* Now the generic Linux version.  */
  73 #undef __sysconf
  74 #define __sysconf static linux_sysconf
  75 #include "../sysconf.c"